Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 211
utilisa-tion factor 917= 1634 or 56% In Fig. 7 the total flux from lamp a •65x400x4ir=3268 lumens, and the total flux from lamp and shade is,282 x2tt = 1770 lumens, and the utilisationfactor, = ^° - 540/3268 ~ A study of the tables in these Ibrings out the well-known fart that thehorizontal… … nz r *ol*r cub*e ofinTEnsiTr Of uhit useo in 0»LL HALL
Lighting
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